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I try to build Win32API engineering Applications..
the output text should Have so Many Latin Letters Like Alpha , Phi , Theta
and many math Symbols Like Square roots.. But I do not know how can I use these symbols with Function DrawText() ,

1) Compile your app as a unicode app, not as a ANSI app.
An ansi app is limited to 256 printable characters and it likely won't contain all the special maths symbols.

if you just need simple one-line one-character at a time maths formula, then DrawText() will do.

Richtext may not really fix your problem.

If you want to handle really complex formulas in a visually aestethic method... You need to have a look at an advanced library to handle such things. visualising math is a branch of graphics programming all on it's own, and it's (still) not even solved anywhere near reasonably on browsers,
most libraries catering to this end up creating bitmaps.

there are even online LATEX to bitmap converters that may do what you need (if you can live with the performance issues with doing this over the internet).